Hello there, I started working at a digital agency months ago and we have our own vps server. The thing we noticed is that it was rather slow (1 sec ttfb and sometimes over 2 secs) so I was searching the net for optimization solutions but didn't find something valuable. It's a centos 6 with a plesk panel. Apache is running with an nginx(as a reverse proxy) and no php-fpm installed yet(is this a major problem?). Are there some goto tips and actions that are mandatory for vps server in order to make it "fly". We have currently 4 wordpress sites running on the vps and i was wondering if the number of sites is slowing down the server. Server has 1gb ram and 1gb swap. All sites running php 5.4. Any other info can be requested. Any help/tip would be useful! Also newbie here. :)
Edit 1: Traffic is not big. I would say for now it's max 15-20 users/site. We expect it will get bigger in 2-3 months time but by then we will have our server upgraded with more ram etc.
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